QemuFwCfgLib: Add QemuFwCfgWriteBytes() function

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14109 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/Include/Library/QemuFwCfgLib.h

@@ -1,7 +1,7 @@
 /** @file
   QEMU/KVM Firmware Configuration access
 
-  Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -102,6 +102,25 @@ QemuFwCfgReadBytes (
   );
 
 
+/**
+  Writes firmware configuration bytes from a buffer
+
+  If called multiple times, then the data written will
+  continue at the offset of the firmware configuration
+  item where the previous write ended.
+
+  @param[in] Size - Size in bytes to write
+  @param[in] Buffer - Buffer to read data from
+
+**/
+VOID
+EFIAPI
+QemuFwCfgWriteBytes (
+  IN UINTN                  Size,
+  IN VOID                   *Buffer
+  );
+
+
 /**
   Reads a UINT8 firmware configuration value
 

OvmfPkg/Library/QemuFwCfgLib/Ia32/IoLibExAsm.S

@@ -1,6 +1,6 @@
 #------------------------------------------------------------------------------
 #
-# Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.  The full text of the license may be found at
@@ -30,3 +30,23 @@ rep insb
     popl    %edi
     ret
 
+
+#------------------------------------------------------------------------------
+#  VOID
+#  EFIAPI
+#  IoWriteFifo8 (
+#    IN UINTN                  Port,
+#    IN UINTN                  Size,
+#    IN VOID                   *Buffer
+#    );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(IoWriteFifo8)
+ASM_PFX(IoWriteFifo8):
+    movw    4(%esp), %dx
+    movl    8(%esp), %ecx
+    pushl   %esi
+    movl    16(%esp), %esi
+rep outsb
+    popl    %esi
+    ret
+

OvmfPkg/Library/QemuFwCfgLib/Ia32/IoLibExAsm.asm

@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------
 ;
-; Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
 ; This program and the accompanying materials
 ; are licensed and made available under the terms and conditions of the BSD License
 ; which accompanies this distribution.  The full text of the license may be found at
@@ -36,5 +36,27 @@ rep insb
 
 IoReadFifo8 ENDP
 
+
+;------------------------------------------------------------------------------
+;  VOID
+;  EFIAPI
+;  IoWriteFifo8 (
+;    IN UINTN                  Port,
+;    IN UINTN                  Size,
+;    IN VOID                   *Buffer
+;    );
+;------------------------------------------------------------------------------
+IoWriteFifo8 PROC
+
+    mov     dx, [esp + 4]
+    mov     ecx, [esp + 8]
+    push    esi
+    mov     esi, [esp + 16]
+rep outsb
+    pop     esi
+    ret
+
+IoWriteFifo8 ENDP
+
     END
 

OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c

@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -50,6 +50,32 @@ IoReadFifo8 (
   OUT     VOID                      *Buffer
   );
 
+/**
+  Writes an 8-bit I/O port fifo from a block of memory.
+
+  Writes the 8-bit I/O fifo port specified by Port.
+
+  The port is written Count times, and the data are obtained
+  from the provided Buffer.
+
+  This function must guarantee that all I/O read and write operations are
+  serialized.
+
+  If 8-bit I/O port operations are not supported, then ASSERT().
+
+  @param  Port    The I/O port to read.
+  @param  Count   The number of times to read I/O port.
+  @param  Buffer  The buffer to store the read data into.
+
+**/
+VOID
+EFIAPI
+IoWriteFifo8 (
+  IN      UINTN                     Port,
+  IN      UINTN                     Count,
+  OUT     VOID                      *Buffer
+  );
+
 
 /**
   Returns a boolean indicating if the firmware configuration interface
@@ -132,6 +158,29 @@ QemuFwCfgReadBytes (
   }
 }
 
+/**
+  Write firmware configuration bytes from a buffer
+
+  If called multiple times, then the data written will
+  continue at the offset of the firmware configuration
+  item where the previous write ended.
+
+  @param[in] Size - Size in bytes to write
+  @param[in] Buffer - Buffer to read data from
+
+**/
+VOID
+EFIAPI
+QemuFwCfgWriteBytes (
+  IN UINTN                  Size,
+  IN VOID                   *Buffer
+  )
+{
+  if (mQemuFwCfgSupported) {
+    IoWriteFifo8 (0x511, Size, Buffer);
+  }
+}
+
 
 /**
   Reads a UINT8 firmware configuration value

OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.S

@@ -1,6 +1,6 @@
 #------------------------------------------------------------------------------
 #
-# Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.  The full text of the license may be found at
@@ -28,3 +28,20 @@ rep insb
     mov     %r8, %rdi           # restore rdi
     ret
 
+#------------------------------------------------------------------------------
+#  VOID
+#  EFIAPI
+#  IoWriteFifo8 (
+#    IN UINTN                  Port,              // rcx
+#    IN UINTN                  Size,              // rdx
+#    IN VOID                   *Buffer            // r8
+#    );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(IoWriteFifo8)
+ASM_PFX(IoWriteFifo8):
+    xchg    %rcx, %rdx
+    xchg    %r8, %rsi           # rdi: buffer address; r8: save rsi
+rep outsb
+    mov     %r8, %rsi           # restore rsi
+    ret
+

OvmfPkg/Library/QemuFwCfgLib/X64/IoLibExAsm.asm

@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------
 ;
-; Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
 ; This program and the accompanying materials
 ; are licensed and made available under the terms and conditions of the BSD License
 ; which accompanies this distribution.  The full text of the license may be found at
@@ -32,5 +32,25 @@ rep insb
 
 IoReadFifo8 ENDP
 
+
+;------------------------------------------------------------------------------
+;  VOID
+;  EFIAPI
+;  IoWriteFifo8 (
+;    IN UINTN                  Port,              // rcx
+;    IN UINTN                  Size,              // rdx
+;    IN VOID                   *Buffer            // r8
+;    );
+;------------------------------------------------------------------------------
+IoWriteFifo8 PROC
+
+    xchg    rcx, rdx
+    xchg    rsi, r8             ; rdi: buffer address; r8: save rdi
+rep outsb
+    mov     rsi, r8             ; restore rdi
+    ret
+
+IoWriteFifo8 ENDP
+
     END